Exhibit 99.1


             CERTIFICATION PURSUANT TO SECTION 1350 OF CHAPTER 63 OF
                       TITLE 18 OF THE UNITED STATES CODE


I, Eric R. Zarnikow, on behalf of the Equity Plans Administrative Committee (the
"Committee") of The  ServiceMaster  Company,  certify that (i) the Annual Report
for the  ServiceMaster  Profit Sharing and Retirement  Plan (the "Plan") on Form
11-K for the plan year ended December 31, 2002, fully complies with requirements
of Section  13(a) or 15(d) of the  Securities  Exchange Act of 1934 and (ii) the
information contained in such Annual Report on Form 11-K fairly presents, in all
material  respects,  the  financial  condition  and results of operations of the
Plan.




                                            /s/ Eric R. Zarnikow
                                            ---------------------
                                            Eric R. Zarnikow
                                            Chairperson of the Equity Plans
                                            Administrative Committee
                                            June 26, 2003


A signed  original  of this  written  statement  required  by Section 906 of the
Sarbanes-Oxley  Act of 2002 has been provided to The  ServiceMaster  Company and
the  Committee  and  will  be  retained  by The  ServiceMaster  Company  and the
Committee and furnished to the Securities  and Exchange  Commission or its staff
upon request.




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